Mac - brew 安裝缺少訪問文件權限

例如：

　　brew install cmake

Error: The following directories are not writable by your user:
/usr/local/share/man/man8

You should change the ownership of these directories to your user.
  sudo chown -R $(whoami) /usr/local/share/man/man8

 

終端執行:

　　sudo chown -R `whoami`:admin /usr/local/bin

　　sudo chown -R `whoami`:admin /usr/local/share

 

解決！